Coupler



FIG. 1 is a perspective view of the coupler of the invention;

FIG. 2 is a side elevational view of the coupler;

FIG. 3 is an opposite side elevational view of the coupler;

FIG. 4 is an end elevational view of the coupler, the opposite end elevational view being a mirror image thereof;

FIG. 5 is a top plan view of the coupler; and,

FIG. 6 is a bottom view of the coupler. 

The ornamental design for a coupler, as shown. 